Compare.

A chatbot answers messages; a health AI agent owns a job end to end, keeps state for days, waits, retries, uses your systems and records every step.

On a platform you write the job and the platform owns channels, models, records and uptime; on a framework you own all of that, with more control and months before launch.

An agency builds the agent for you on a platform or a framework; you still need a home for it afterwards and a plan for the day the agency moves on.